const stringFyQueryString = function (obj) {
    //对象序列化【对象转url参数】
    if (!obj) return ""
    let pairs = []
    for (let key in obj) {
        let value = obj[key]
        if (value instanceof Array) {
            for (let i = 0; i < value.length; ++i) {
                pairs.push(
                    encodeURIComponent(key + "[" + i + "]") + "=" + encodeURIComponent(value[i])
                )
            }
            continue
        }
        pairs.push(encodeURIComponent(key) + "=" + encodeURIComponent(obj[key]))
    }
    return pairs.join("&")
}
